At the beginning of each simulation, I remind the 3 mediators/participants that it is better (a) to speak one at the time and (b) be aware that since their words will have to travel through continents and oceans, they will be heard 1-2 seconds later.
This technical shortcoming, however, often turns out to be a blessing in disguise.
Pretty soon, mediators learn how to ask fewer, simpler and shorter questions – making each word count. And such a need to communicate more efficiently gradually forces mediators to think more efficiently as well. In other words, they start figuring out how to get all the information they need from the parties (their interests, priorities, dreams, doubts, fears and so on) – by asking them the minimum number of questions.